The Dynamical Dipole Radiation in Dissipative Collisions with Exotic Beams

TL;DR

This paper investigates the dynamical dipole radiation in dissipative heavy ion collisions using exotic beams, highlighting its sensitivity to the isovector part of the nuclear EoS and exploring observable effects in reactions with neutron-rich nuclei.

Contribution

It provides a detailed analysis of the properties and implications of dynamical dipole radiation in dissipative collisions, emphasizing the role of exotic beams in probing the symmetry energy.

Findings

Dynamical Dipole Radiation shows distinct isospin effects in fusion and deep-inelastic collisions.

Reactions with unstable 132Sn beams are promising for testing the sub-saturation isovector EoS.

Predictions indicate observable signatures in spectra, yield, and angular distributions related to isospin dynamics.

Abstract

Heavy Ion Collisions (HIC) represent a unique tool to probe the in-medium nuclear interaction in regions away from saturation. In this work we present a selection of reaction observables in dissipative collisions particularly sensitive to the isovector part of the interaction, i.e. to the symmetry term of the nuclear Equation of State (EoS). At low energies the behavior of the symmetry energy around saturation influences dissipation and fragment production mechanisms. We will first discuss the recently observed Dynamical Dipole Radiation, due to a collective neutron-proton oscillation during the charge equilibration in fusion and deep-inelastic collisions. We will review in detail all the main properties, yield, spectrum, damping and angular distributions, revealing important isospin effects. Reactions induced by unstable 132Sn beams appear to be very promising tools to test the sub-saturation Isovector EoS. Predictions are also presented for deep-inelastic and fragmentation collisions induced by neutron rich projectiles. The importance of studying violent collisions with radioactive beams at low and Fermi energies is finally stressed.